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hmtiling
No offence to your builder but this is most definitely a job for an experienced tiler. preparation is paramount with tiles of this size, especially when thin porcelain.Thanks for all the advice guys, what a great forum!
I don't have a tiler lined up yet but mentioned it to my builder who said he would do it if I wanted him to, the extension hasn't started yet but shouldn't be too long off, I wanted to arm myself with some facts at the outset to avoid some costly mistakes later on....
LocalTiler is this a job you would like to quote for, though I see you are quite a distance, Yorkshire?
There's a section to list the job on here and some very qualified tilers too. Good luck!